Disk-sharpener



S. W. SNYDER.

DISK SHARPENEH- APPLICATION FILED mvs.191s.

Patented Sept 9, 1919.

2 SHEETS-SHEET 1.

S. W. SNYDER.

DISK SHARPENER- APPLICATION FILED nus. 191a.

Patented Sept. 9, 1919.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

SAMUEL W. SNYDER, 0F HAYES CENTER, NEBRASKA, ASSIGN OR 0F ONE-HALF TO U. A. READY, 0F HAYES GEN TER, NEBRASKA.

DISK-SHARPENER.

Specification of Letters Patent.

Patented Sept. 9, 1919.

To all whom it may concern:

Be it known that I, SAMUEL N. SNYDER, a citizen of the United States, residing at Hayes lentcr, county of Hayes, and State of Nebraska, have invented certain new and useful Improvements in Disk-Sharpeners; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of, reference marked thereon, which form a part of this specification.

My invention relates to improvements in means for sharpening disks or rotary cutting devices employed in connection with disk harrows, sulky plows, cultivators and various other implements used for preparing the ground for crops or stirring it up after the crop is in, either for the purpose of removing weeds or to facilitate the growth of plants and other vegetation. In other words, my improvement is adapted for use in sharpening disks of all classes, but particularly those employed in connec tion with agricultural implements.

The construction generally speaking consists of a frame suitably supported and adapted to hold the disk or support it so that it is free to rotate, the frame being mounted in such proximity to a grinding or sharpening wheel, as an emery wheel, that the rotation of the wheel also rotates the disk on its support, the relation of the wheel and disk being such that the sharpening wheelnot only imparts rotation to the disk but also simultaneously performs the grinding or sharpening function, since the wheel engages the disk at one side of its axis of rotation, thus imparting rotary movement to the disk so that the periphery or outer portion of the latter to be sharpened, moves across the face of the emery wheel at an angle to the sharpening face of the wheel. In other words, the periphery of the disk intersects the curved face of the wheel in such relation that the latter satisfactorily and automatically performs the shaipeniug or grinding function, after the disk is put in place and the emery wheel started.

Having briefly outlined my improvement 1 will proceed to describe the same in detail, reference being made to the accompanying drawing in which is illustrated an embodiment thereof. In this drawing:

Figure 1 is a perspective view of my improved disk holding member.

I Fig. 2 is a section taken on the line 2-2,

Fig. 3 is a fragmentary section of the disk holder taken vertically through the bend in the arm of the latter.

Fig. 4: is a top view illustrating my improved device arranged in cooperative re lation with an emery or other suitable grinding or sharpening wheel, the disk being alsoshown in place and on a smaller scale than in the previous views.

Fig. 5 is a fragmentary elevation looking in the direction of arrows 5, Fig. 1, the parts however, being shown on a larger scale.

Fig. 6 is an elevation looking in the direction of arrows 6, Fig. 5, the disk being shown partly in section.

Fig. 7 is a similar view showing a slightly modified form of construction.

Fig. 8 is an elevation illustrating an antifrictional wheel, the part with which the wheel is connected being shown in section.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate the disk-holding member considered in its entirety and comprising an arm 6 having an angular projection 7 at one end, a downwardly offset part 8 adjacent the part 7 a bond 9 remote from the part 7, an upper part 10 beyond the bend and a part 12 hingedly connected with the part 10, as shown at 13. A relatively heavy leaf spring 14 is connected with the part 10 by means of a stud bolt 15 which is anchored in the part 10 and passes upwardly through a perforation in the spring, a spiral spring 16 surrounding the bolt and located between the spring and the part 10, a wing nut 17 being threaded on the bolt for tension purposes. The spring 14 is bow shaped and curves upwardly from the parts 10 and 12. The spring has a relatively long member 18 extending beyond the stud bolt toward the right (see Fig. 1) and a relatively short member 19 engaging the part 10 on the oppothe plate site side of the stud bolt. The free extremity of the part 18 of the spring is adapted to pass through a perforation 20 formed in the hinged part 12 near its outer end, the latter which I will designate by the numeral 21, being bent upwardly frictional device as a caster-wheel 22, which is swiveled on the lower extremity of a bent shank 23 which is secured to the part 21 by a nut 21 which is threaded on the upper extremity of the shank. This casterwheel forms an antifrictional pressure device which engages the disk 25 during the sharpening operation. By virtue of the angular shape of the shank the relation of the antifrictional device to the part 21 and the disk may be varied as circumstances may require, depending conditions which may exist while using my improvement. The downwardly offset part 8 of the arm 6 is provided with a pin. 26 which has a reduced depending threaded shank 27 passing through an elongated opening 28 formed in the offset part, the pin being held in place by a nut 29 threaded on its lower protruding extremity, the nut being of sufiicient size to bridge the slot. Above the slot the pin is provided with a stop collar 30. This downwardly offset part of the arm 1 is utilized in connection with disks having a relatively long hub 31 (see Fig. 7). \Vith disks of this character it is important that they should be mounted on a part 8 below thebody of the arm in order to bring the disk mounted on the pin 26 into proper cooperative relation with the emery wheel or other grinding member 32. In sharpening disks which do not have a hub 31 extending be yond their convex surfaces, the disk is mounted on a square post 33, the latter being rotatable on a pin 34 which is adjustable in a slot 35 formed in a removable plate 36 which bridges the space between the down wardly bent parts 37 of the ofiset member 8, 36 being secured to the arm by means of. bolts 38 and nuts 39. The spindle 37 is adjustable on the plate 36 by loosening a nut 40 which is employed to fasten the spindle in the desired position of adjustment.

The hubs 31 projecting from the convex surfaces of the disks as heretofore described, have cylindrical perforations, consequently the pin 26 is cylindrical in shape to fit said perforations. Again, the disks 25 which do not have the long hubs have centrally lo cated square perforations which fit the post 33 of counterpart shape, the latter having an enlargement 11 at its base to support the disk from actual contact with the plate 36.

From what has been said it will be understood that the arm6 as illustrated in Fig. 1 is equipped for holding either style of the disk, that is to say, the one illustrated in Fig. 6 or that shown in Fig. 7 in such a manner and carrying anantion the shape and size, and other as to bring the edge of the disk to be sharpened in proper relation to the emery or grinding wheel 32 without changing the position of the wheel.

As illustrated in the drawing, my improved device is adapted to be connected in operative relation with one side of the journal box 12 of the shaft A3 upon which the emery wheel 32-is mounted. This is illus trated in Figs. 1 to 7 inclusive. The two bolts 414 which pass through the parts of the journal box on one side are passed through slots formed in the part 7 of the arm, this part being slightly offset downwardly from the body of the arm, as shown at &6. After the bolts 44; are secured in place the disk holder sags slightly downwardly occupying an inclination with a horizontal plane, as best illustrated in Figs. 6 and 7. This brings the disk when in position for sharpening purposes in proper relation with the grinding face of the emery wheel to give the de sired bevel to the edge of the disk. This bevel, however, may be regulated in length by the adjustment of the disk upon the holder, whether the disk is of the construction shown in Fig. 6 or Fig. 7 since the parts which support the pins or posts upon which the disks are mounted are adjustable lengthwise of the parts 8 and 36 respectively. 5

The hinged part 12 is important since the disks with which my improved device is employed vary in size and shape, andwith some of these disks the antifrictional device or caster-wheel 22 must occupy a more elevated position than with other disks. This is permissible, since the part 12 is hingedly connected with the part 10, as heretofore explained. When the disk is first put in place, the spring 18 is thrown out of c0i5perative relation with the arm 12. After the. disk is in place the spring is lifted through the medium of a hand piece 4C7 which is secured to the springnear the free extremity of the part 18, thus making it practicable to bend the spring upwardly against its tension. As soon as it is properly adjusted it is allowed to engage the part 12, its adj acent free extremity entering the perforation 20 of the part 21. This spring exerts sufficient pressure through the medium of the antifrictional device 22 to hold the disk in proper cooperative relation with the grinding face of the emery Wheel as the disk rotates.

From the position of the parts, as best illustrated in Fig. 1, the manner of automatically operating the disk during the grinding operation will be readily understood. The hinged parts 10 and 12 of the arm 6 are bent laterally out of alinement with the part 6 of the arm so that the anti frictional device 22 engages the concave surface of the disk in oppdsing relation to the engagement of the grinding wheel 32, the

latter engaging the disk out of aliuemeut with the disk supporting part 6 of the disk holder so that the engagement of. the face of the ei'nery wheel with the disk will be at such a point or location as to impart rotation to the disk in the direction indicated by the arrow in. Fig. 1-. At the same time the rotary movement of the grinding wheel 82 with its shaft4l3 .is such as to grind or sharpen the disk, since the grinding face of the wheel and the face of the disk to be ground are moving in different directions, the two movements being such that a suitable cooperative arrangement is brought about to accomplish the desired function.

As illustrated in the drawing, the emery wheel shaft is provided with a pulley 48 which is connected (see Fig. 5) with a belt [-9 leading from a suitable motor or line shaft (not shown);

From the foregoing it will be understood that disks of the character indicated are automatically sharpened after they are put in place upon the disk-carrying member and in proper relation with the emery wheel, the only requirement on the part of the person in charge of the work being that he take ofl the sharpened disk and put another in its place, the sharpening operation being entirely automatic as long as the emery 'wheel or other grinding or sharpening device is kept in motion. I have found this device exceedingly efficient in the performance of the aforesaid function, both as to the quality of the work and the facility with which it is performed. At the same time the device is comparatively inexpensive.

Another feature of importance consists in the fact that no special skill on the part of the operator is required.

The disk holder 5 is provided adjacent the bend 9 with a strengthening bolt 50 whose head is countersunk in the upper part 10 and passes through an opening in the lower part 6, the protruding extremity of the bolt being threaded to receive a fastening nut 51. This bolt stifi'ens .and reinforces the device, as will be readily understood.

hat I claim is z- 1. A disk holder, comprising an arm having two members, one member being relatively stationary and carrying a post adapted to receive the disk and permit the latter to rotate, while the other member is provided with means adapted for operative engagement with the disk.

2. A disk holder, comprising an arm having two members, one member carrying an adjustable post adapted to receive the disk and permit the latter to rotate, while the other member is provided with means adapted to operatively engage the disk.

3. A disk holder, comprising an arm having two members, one member being slotted,

a post adjustably mounted in the slot and adapted to receive the disk to permit the latter to rotate, while the other member is provided with means to engage the disk in operative relation.

l. A disk holder, comprising an arm having two members, one member carrying a post adapted to receive the disk and permit the latter to rotate, while the other member is provided with means to engage the disk in operative relation, said members being arranged at an acute angle to each other.

5. A disk holder, comprising an arm having two members, one member being relatively stationary and carrying a post adapted to receive the disk and permit the latter to rotate, while the other member is provided with means to engage the opposite side of the disk, said members being arranged at an acute angle to each other and hingedly connected to each other.

6. A disk sharpener comprising in combination with a rotary grinding member, means on which the disk is rotatablymounted in suitable proximity to the grinder, said means consisting of an arm having upper and lower members, one member being relatively stationary and forming the support for the disk while the other member engages the disk on the opposite side from the grinder.

7. A disk comprising in combination with a rotary grinder, means on which the disk is rotatably mounted in suitable proximity to the grinder, said means consisting of an arm having upper and lower members, one member being relatively stationary and forming the support for the disk while the other member is equipped with an antifrictional device which engages the disk on the opposite side from the grinder.

8. A disk sharpener comprising in combination with a rotary grinder, means on which the disk is rotatably mounted in suitable proximity to the grinder, said means consisting of an arm having upper and lower members, one member forming a support for the disk while the other member yieldingly engages the disk on the opposite side from the grinder.

9. A disk sharpener comprising in com- 115 bination with a rotary grinder, means on which the disk is rotatably mounted in proximity to the grinder, said means consisting of an arm having upper and lower members, one member forming a support for the disk 120 while the other member has a hinged part spring held in operative engagement with the disk and in opposing relation to the grinder.

10. A disk sharpener comprising in com- 1 bination with a rotary grinder and a disk, means on which the disk is rotatably mounted in suitable proximity to the grinder, said means consisting of an arm having upper and lower members, one member forming a 130 support for the disk while the other member has a hingedly connected part carrying an antifrictional device engaging the disk in opposing relation to the grinder, and a leaf spring mounted on the arm and acting on the hinged part to yieldingly retain the latter in engagement with the disk.

11. A disk holder comprising an arm having upper and lower members, the lower member being relatively stationary and carrying a post adapted to receive the disk and permit the latter to rotate, while the other part is provided with an antifrictional member, spring held in operative engagement with the disk.

12. A disk holder comprising an arm having upper and lower members, the lower member carrying an adjustable post adapted to receive the disk and permit the latter to rotate, While the other part is provided with Copies of this patent may be obtained for five cents each, by addressing the an antifrictional member spring held in op erative engagement with the disk;

13. A disk holder comprising an arm having upper and lower members, the lower member being slotted and equipped with a disk-holding part adjustable in the slot,

while the other part is provided with an.

antifrictional member spring held in operative engagement with the disk.

14. A disk holder comprising an arm having upper and lower members, the lower member being relatively stationary and car: rying a post adapted to receive the disk and permit the latter to rotate, while the other part is bent upwardly at its outer extremity and equipped with a pin carrying a roller swiveled thereon.

In testimony whereof I afiiX my signature.

SAMUEL W. SNYDER.

Commissioner of Patents,

Washington, D. G. 

